Professional clothes in a FREEZING office?

So my office is really, really cold — I’d say 55-60. I am small and have poor circulation. Dress code is business casual, so I don’t need to be super dressed up, but I can’t wear hoodies, and I’d like to err on the professional side of business casual.

I wore a pair of uniqlo heat tech legging-pants today, but they honestly didn’t feel like quite enough. Any suggestions on warm, snug, decently professional-looking clothes?